Tap and reamer.



vtransverse sections on the lines o a and b b,

r non.

TAF AND BEAMER.

Specification of Application le August 5,

To atl whom it may conce/rn Be it known that I, FRANK E. BooousnLsKr, of Richmond, in the county of Heir rico and State of Virginia, have invented a certain new and useful Improvement in Taps and Rea-mers, of which improvement the following is a specification.

My invention relates to taps and reamers 'for truing and cutting screw threads 1n holes in pieces of metal, and its object is to provide means whereby the guides and driving stems of taps and reamers may be readily and quicklyA detached from and attached `t0 the bodies of said cutting tools, and be held securely connected thereto during their operation, thereby enabling it to be carried on in locations where limitation ot space would interfere with that ot' a tapl or reamer of the ordinary construction.

The improvement claimed is `hereinafter fully set forth.

In the accompanying drawings: Figure l is a view, partly in. elevation and partly in longitudinal central section, of a staybolt tap and reamer, illustrating an embodiment of my invention; Fig. 2, a similar view showing a structural modification; Fig. 3, a longitudinal central section, on an en. larged scale, through a portion of the appliance shown in Fig. l; Figs. Il and of Fig. 3; Fig. G, a view, partly in elevation and partly in longitudinal een trail section, of a tap showing a further structural 1nodification;'an l, Figs. 7 and S, transverse sections, on the lirios c c and (l l respectively, of Fig. t3.

lt is necessary 'for the operation of taps, reamers, and met-al cutting tools ot' similar character, in certain classes oi work, that their bodies should be provided with a guide stem at one end o'tx their cutting mem bers, and a driving stem at the other, and lthese stems, which are o'lten ot considerable length, have ordinarily been integral, with the bodies ol the tools. When operating in situations where space is limited,Y as in the combustion chan'ibers o't steam boilers, inconvenience and delay often macasioned by reason of the projecting stems coming in Contact with parts o't a structure other than those on which the work is being done., so

respectively,

that time is lost in the hacking out ol the tool which often becomes necessa ry. '.tvly invention avoids this objection by infoviding stems which are quickly detachable and at- Letters Patent. Patented Oct 8, 1912.

i912. sei-iai No. 713,207.

tachable as conditions may require, while being so connected to the bodies oi the tools,

as.to be exempt ltrom liability to accidental and undesired detachment during their operation.

Referring irst to Figs. l and 3 to 5 in! elusive, my invention is herein exemplified as applied in connection with a stay bolt tap and reamer, the body, 1of which is provided with the usual screw cutting threads, l, and roaming cutters, 1". In the practice ot my invention, a-driving stem, 2, is detachably connected to one end oi the body of the tool, and a guide stem, 3, is similarly connected tothe opposite end thereof, the connection being effected, in the application to taps and reamers o'i" the ordinary construction, by the following means. An externally threaded extension, 1, is formed on each end of the body, l, and a cylindrical stem, 4, is screwed on each of said extensions. The coupling stems are reduced in diameter beyond the portions which engage the extensions, l, and their so reduced portions are fitted truly in cor responding bores in the adjaecntends of the driving stem, 2, and guide stem, 3, the ends of which abut against shoulders at. the ends of the larger' diameter portions of the coupling stems, 4, as clearly shown in Fig. 3. stems, 2 stems, 4l, and the connected body is prevented by transverse pins, 5, fixed m the coupling stems and engaging longitudinal slots, G, in the driving and guide stems, which slots are open at the ends of said stems. Accidental longitudinal displaeef ment of said stems from their normal positions on the coupling stems, 4, prevented by yielding spring catch mechanisms, each otwhich comprises a pair ot ball latches, 7, fitting in a transverse opening, 4, in one ot' the couplingvstems, and 'forced into engagement with an internal groove or socket, T, in the connected guide stem or driving stem, by an interposed spring, '7b. The ball latches are held in position by a nut, T", which partially incloses one of them and is screwed into the end ot the opening, 4th lt' preferred, a single ballY latch, operating similarly to each ot the two similar mem bers described, may be used in each mech anism.

lt will be obvious to those :familiar with the manipulation of taps, reamers, and anand 3, relatively to the'coupling ot' the` tool,

Rotation of the driving and guide readilyV applicable, at inc onsiderable.costfte alogous metal cutting tools, thatva"construc-` tion substantially as -aboveydescribem Fis.

Such tools, and that, vin their operatiomthe driving and guide stems-'Will be securely held to the tool, and the detachment and attachment of either or both of them may. be

v instantly effected 'Whenl necessary orfV de?.

sirable. y 1

Fig. 2 illustrates a structuralmodification Which is desirably applicable in themanufacture of new tools, and differs from the construction first described only in the particular that the coupling stems, 4, are, in this case, made integral withr the body', l, of' thev tool, instead of being screwed to 'threaded extensions thereof. The means for preventingindependent rotation, and accidental longitudinal displacement of the driving and guide stems are similar to those before described.

- Figs. 6 to 8 inclusive show a stay bolt tap,

' havingan integral driving stem, 2, formed .on one end of its body, l, and having its body bored out at, and for a substantial distance from, its opposite end, to receive -a guide stem, 3, which is reduced in diameter .at its end adjoining the body fora distance corresponding substantially With the length of the bore of the `body and is fitted truly therein. Rotary movement of thev guide stem, relatively to the body of the tool, is prevented by a pin, 5, vfixed in the guide stem and engaging open ended slots, 6, in the adjoining end of the tap body, and a yielding spring catch mechanism similar to that before described is provided for preventing -accidental longitudinal displacement of the guide stem, the ball latches, 7, in this case fitting in the guide stem, and engaging recesses in the body of the tap.

It Will be seenthat. this construction emT bodies the same structural and operative principles as those before described, the" s'tructural difference being the immaterialone that in this case, the engagement of the stem with the body is effected by vtting the stem within the body, While in leases, the extensions of the body are fitted Within lthe stems.

.l claim as my lnvention and desire to. secure by Letters Patent:

' 1.A The combination, with a metalicutting the former its body cfa stem 'longitudinali engaging jonelendi'ofthe body ofthe tooi nected'detachably thereto. by a slip joint.

2' The Combinationof a metal cutting and coneral cutting jmelibers v on:A

tool having peripheral cutting memberscn"l its body, a stem longitudinally engaging one end ofthe body,- means 4:or preventing independentrotary movement of the stem, rela-` c tively to the body, and means for preventing accidental longitudinal movement of the stem, relatively tothe body.

' 3; The combination ofa metal cutting tool having peripheral cutting'members on its.

body, a stem longitudinally engaging one end of the body, a transverse pin iXed. in one ofsaid engaged members and fitting open ended longitudinal slots in the other,

and means for preventing accidental relain one of said engaged members and fitting open ended longitudinal slots vin the other,A

and a yielding spring catch Amechanism interposed betiveen'said engaged'members for preventing accidental relatlve longitudinal movement thereof. i Y

G.l The combination of a metal .cutting tool having peripheral cutting-.membersl on its body, a stem longitudinally engaging one Aend of the body, means for preventing independent rotary movement of said'engaged.

members, a ball` latch fitted in one 'of said engaged members andengaging. a socket in said ball latch in engagement.

FRANK E.' BGCORSELSKI. Witnesses i A. S. FOWLER, R. C. SMrrH.

'roo the other, and Aa spring normally holding 

